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PWM controled pump and fans possible? - Page 2

post #11 of 26
Thread Starter 
Basically, I'm trying to mimic an aquaero's control functions, but without the aquaero. I want to see if I can have my radiator fans and pump automatically adjust their speed (without interference on my part) to maintain a reasonable temp.

Assuming that I use fans with a max rpm of 1200 and the pump has a max of 4500; If I were to ONLY use the tachometer from say the fans, the pump might never get above 1200 rpm's. Alternatively, If I only used the tach. from the pump, the fans might end up going full blast all the time.

Also, I would only be using the CPU header for the PWM signal. All power for the pump and fans would come from molex.

This would be my first build ever. I am planning on starting it hopefully by June. Right now I am just trying to plan out how I would like it to work.
post #12 of 26
Quote:
Originally Posted by somebadlemonade View Post

if you're just splitting the pwm signal and getting 12v power from a molex it's a non-issue, just make sure you don't draw more than 1 amp from a motherboard fan header, though some motherboards can handle 2 amps, i just wouldn't want to roll the dice like that
akasa makes a 5 way pwm splitter that takes the 12v power from a molex

that is a different thing, the 5 way pwm splitter that you are talking about is lets to be able to have one source of power, which is the molex, then 5 pwm signal cable should be plug in the 5 pwm header in the mobo. The op is asking a different thing he wants to connect 2 devices which are a fan and a pump into only one mobo pwm header.

You should not be sending 2 pwm signals into only one header, it will mess up the readings, thats why someone here suggest to cut one pwm signal to let only one signal reports to the mobo, this solution works if you are using 2 identical things, 2 fans for example. The mobo won't gonna be able to control "properly" 2 unidentical things. It will work, why not, but the rpm's will be here and there.
post #13 of 26
"Assuming that I use fans with a max rpm of 1200 and the pump has a max of 4500; If I were to ONLY use the tachometer from say the fans, the pump might never get above 1200 rpm's. Alternatively, If I only used the tach. from the pump, the fans might end up going full blast all the time."

Thats exactly what i think too.
post #14 of 26
I've been doing exactly this with a rheosmart to control regular fans.

Everything comes out of the CPU fan header and controlled via speedfan. The PWM signal is split between the pump and rheosmart.

There is nothing to confuse, PWM is nothing more than power on/off pulses. 80% PWM just means the on time is 80% of the cycle and 20% off going from motherboard out.

There is no communication going on, just reading the PWM signal split between the two.

I've been running like this for over a year now, no problem. The only downside is you can't independently control pump/fan. I have been using yate loon slow speeds off the rheosmart and the 35X and have been dialing down to 5%PWM which is about 600RPM on the fans. Works no problem..thumb.gif

You can split PWM signal many times, not sure what the limit is, but I know several who have split 3-4 times or more.
    
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post #15 of 26
I suggest that you should just get a silent fan, cougar vortex for example is virtually silent, you can run it at full you wont still hear it
post #16 of 26
Thread Starter 
Thank you Martin! That is what I wanted to know. If it's just a percentage that gets sent out than it shouldn't matter. Also, this idea came about because of your review on the 35x so double thanks

Plus I just learned that SYS_FAN header is a four pin so that means there should be two on the motherboard.
Edited by moy - 1/30/12 at 7:16pm
post #17 of 26
Quote:
Originally Posted by Martinm210 View Post

I've been doing exactly this with a rheosmart to control regular fans.
Everything comes out of the CPU fan header and controlled via speedfan. The PWM signal is split between the pump and rheosmart.
There is nothing to confuse, PWM is nothing more than power on/off pulses. 80% PWM just means the on time is 80% of the cycle and 20% off going from motherboard out.
There is no communication going on, just reading the PWM signal split between the two.
I've been running like this for over a year now, no problem. The only downside is you can't independently control pump/fan. I have been using yate loon slow speeds off the rheosmart and the 35X and have been dialing down to 5%PWM which is about 600RPM on the fans. Works no problem..thumb.gif
You can split PWM signal many times, not sure what the limit is, but I know several who have split 3-4 times or more.

You too are talking about different thing, you are using one fan and connected it to 2 different controller. The op wants to connect 2 unidentical devices into only one controller/header. Just as i said, it will work, but not properly
post #18 of 26
Quote:
Originally Posted by ghostrider85 View Post

You too are talking about different thing, you are using one fan and connected it to 2 different controller. The op wants to connect 2 unidentical devices into only one controller/header. Just as i said, it will work, but not properly

that is if he wants to see the rpm of both things, if not it's a non-issue the pwm signal works like martin said. . .

funny how that has been said multiple times by different people, you're the only one refuting it, something tells me you're the one that's wrong
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post #19 of 26
Quote:
Originally Posted by ghostrider85 View Post

You too are talking about different thing, you are using one fan and connected it to 2 different controller. The op wants to connect 2 unidentical devices into only one controller/header. Just as i said, it will work, but not properly

The Rheosmart 6 controller can be connected to the PWM 4pin header of your motherboard and the controller can use the motherboard's PWM signal to control any of it's 6 channels. The fan controller actually has a 7th port just to connect to your motherboard's PWM 4pin header. That's why some of us are recommending the Rheosmart 6 since you can control your fans/pumps/cathodes via your motherboard's PWM or through the knob. The good part is that each channel can be set to either PWM mode or manual mode, so not everything has to run either way. I personally use one, so I can attest to it's usefulness and it seems to suit the OP's needs just fine.
    
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post #20 of 26
Quote:
Originally Posted by Martinm210 View Post

There is nothing to confuse, PWM is nothing more than power on/off pulses. 80% PWM just means the on time is 80% of the cycle and 20% off going from motherboard out.
There is no communication going on, just reading the PWM signal split between the two.

Straight up duty cycle.
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